Method and system for efficient pyrolysis recovery and resource cyclic utilization of retired wind power blades

Abstract

The invention discloses a method and system for efficient pyrolysis recovery and resource cyclic utilization of an ex-service wind power blade, and the method comprises the following steps: cutting the ex-service wind power blade, and carrying out primary pyrolysis at 400-600 DEG C to obtain a primary pyrolysis blade with a locally carbonized resin matrix; carrying out microwave enhanced pyrolysis on the primary pyrolysis blade, and inducing to generate local high temperature and targeted energy to enhance the deposition effect of carbon dots on fibers by utilizing the strong wave absorbing characteristic of carbon-based components in the primary pyrolysis blade, so as to synthesize a fiber-carbon dot composite material in situ; a solid product obtained through microwave enhanced pyrolysis is screened, and a fiber-carbon dot composite material and a carbon black material are separated out; the fiber-carbon dot composite material is used for preparing concrete. According to the method, rapid and efficient dissociation of the resin and the fiber in the retired wind power blade is realized, the treatment time is shortened, and the pyrolysis energy consumption is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of resource recovery, and in particular to a method and system for efficient pyrolysis recovery and resource recycling of retired wind turbine blades. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Renewable energy such as wind power and solar energy are gradually transforming from supplementary energy to alternative energy, and have promoted the adjustment of the global energy structure. At the same time, they have also brought new problems in the recycling of wind power solid waste resources.

[0004] At present, the sustainable development of the wind power industry faces the problem of large-scale decommissioning and resource recycling of wind turbine blades; the main recycling and disposal methods for retired wind turbine blades worldwide include landfill, mechanical recycling, incineration, chemical dissolution and pyrolysis recycling. In comparison, pyrolysis recycling technology can maximize the recycling of high-value fiber materials in blades, and the combustible pyrolysis oil / gas produced by pyrolysis can also provide energy for the pyrolysis process itself through combustion tissue, which is an advantageous way to give full play to the energy properties and material properties of waste blades. However, the key difficulty in the treatment of waste blades by pyrolysis recycling technology is that the surface of the dissociated fiber will be deposited and adhered by the carbon points remaining from the pyrolysis of the resin matrix, and it is not easy to separate due to the strong mechanical bond. Even if the temperature rises, the strength of the carbon points does not change much. In order to obtain purer recycled fibers, it is often necessary to remove the residual carbon points in the recycled fibers through a reoxidation process or chemical treatment using solvents. However, the secondary oxidation removal process of the deposited carbon not only increases the recycling and disposal process and cost of retired wind turbine blades, but also causes structural defects and performance damage to the recycled fibers.

[0005] In summary, there are mainly the following technical problems in the recycling of retired wind turbine blades:

[0006] (1) The existing pyrolysis technology for retired wind turbine blades has long heating temperature and insulation time, low pyrolysis efficiency and higher energy consumption.

[0007] (2) The pyrolysis products of retired wind turbine blades - there is carbon deposits on the fibers, which need to be removed by reoxidation or adding chemical reagents. The recycling and disposal process is more complicated and costly.

[0008] (3) The regenerated fibers obtained by the existing retired blade recycling technology lack a back-end application outlet and cannot truly promote the resource recycling of retired wind turbine blades. Summary of the invention

[0009] In order to solve the above problems, the present invention proposes a method and system for efficient pyrolysis recovery and resource recycling of retired wind turbine blades, which achieves rapid and efficient dissociation of resin and fiber in retired wind turbine blades, shortens processing time and significantly reduces pyrolysis energy consumption.

[0010] In some embodiments, the following technical solutions are adopted:

[0011] A method for efficient pyrolysis recovery and resource recycling of retired wind turbine blades, comprising:

[0012] After cutting the retired wind turbine blades, the blades are placed at 400-600°C for primary pyrolysis to obtain primary pyrolysis blades with partial carbonization of the resin matrix;

[0013] The primary pyrolysis leaves are subjected to microwave-enhanced pyrolysis, and the strong wave-absorbing characteristics of the carbon-based components in the primary pyrolysis leaves are used to induce local high temperatures, and targeted energy is used to enhance the deposition of carbon dots on the fibers, so as to synthesize fiber-carbon dot composite materials in situ;

[0014] The solid products obtained by microwave enhanced pyrolysis were screened to separate the fiber-carbon dot composite material and the carbon black material.

[0015] Wherein, the fiber-carbon point composite material is used to prepare concrete; the preparation process is as follows:

[0016] 3-6 parts of fiber-carbon point composite material, 80-100 parts of sulfur-aluminum-iron low-carbon cementitious material, 10-15 parts of silica fume, 5-10 parts of slag powder, 1-2 parts of steel fiber, 1-3 parts of water reducer, 0.2-0.6 parts of retarder, 0.1-0.2 parts of defoamer, mortar-sand ratio of 1.2, water-cement ratio of 0.20, stir evenly and pour into shape, demould after a set time and place in a standard curing room for curing for a set number of days to prepare high performance / ultra-high performance concrete.

[0017] In other embodiments, the following technical solutions are adopted:

[0018] A system for efficient pyrolysis recovery and resource recycling of retired wind turbine blades, comprising:

[0019] A wind turbine blade cutting device, used for cutting retired wind turbine blades;

[0020] A primary pyrolysis furnace is used to place the cut retired wind turbine blades at 400-600°C for primary pyrolysis to obtain primary pyrolysis blades with partial carbonization of the resin matrix;

[0021] A microwave pyrolysis furnace is used to perform microwave-enhanced pyrolysis on primary pyrolysis blades to enhance the deposition of carbon dots on the fibers to synthesize fiber-carbon dot composite materials;

[0022] The separation device is used to screen the solid product obtained by microwave enhanced pyrolysis to separate the fiber-carbon point composite material and the carbon black material.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) Thermosetting resin-based composites in retired wind turbine blades have high hardness and density, are difficult to dissociate directly, and have poor thermal conductivity. Conventional pyrolysis technology based solely on "outside-to-inside" heat conduction is difficult to balance pyrolysis effect and economy; and microwave pyrolysis technology based solely on "inside-to-outside" overall heating is directly restricted by the weak microwave absorption capacity of the original components of the blades and the efficiency of microwave energy utilization. The present invention proposes to first use conventional heat sources at 400-600°C to achieve local degradation of the resin matrix in retired wind turbine blades and formation of primary pyrolytic carbon; then apply microwave-enhanced pyrolysis process, microwave energy is efficiently and selectively acted on the primary pyrolytic carbon with strong wave absorption characteristics to form micro-domain high-energy sites, the overall pyrolysis temperature is only slightly increased, but the local high temperature of the pyrolytic carbon particles (up to 1000-2000°C inside) and the induced effect can greatly accelerate the pyrolysis process, shorten the pyrolysis time and improve the pyrolysis efficiency. The conventional pyrolysis reaction time is generally 60-90 minutes, and the method of the present invention can shorten the total pyrolysis time to 18-34 minutes; thereby, the total pyrolysis time can be shortened by 50-80%.

[0025] (2) The present invention strengthens the deposition of carbon dots on the fiber surface based on microwave local thermal shock, resulting in the in-situ assembly and strong bonding of fiber-carbon dot composites. This is contrary to the separation of carbon dots and fibers emphasized in the prior art. By strengthening the bonding between fibers and carbon dots, on the one hand, the original strength of the fibers in the composite is guaranteed, and on the other hand, the roughness of the fiber surface is improved, which can further strengthen the fiber interface bonding ability, thereby improving the splitting tensile strength and bending strength of concrete. In addition, the carbon dots attached to the fibers also enhance the dispersion of the carbon dots in concrete, and the carbon dots can also play an internal curing role in concrete, and broaden the functional applications of concrete in induction heating, electromagnetic shielding, fire protection and antifreeze.

[0026] Other features and advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the process of a method for efficient pyrolysis recovery and resource recycling of retired wind turbine blades in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] In one or more embodiments, a method for efficient pyrolysis recovery and resource recycling of retired wind turbine blades is disclosed, combined with Figure 1 , specifically including the following process:

[0031] (1) After the retired wind turbine blades are properly cut, they are placed in a conventional pyrolysis furnace for primary pyrolysis at 400-600°C for 10-30 minutes. The pyrolysis process is carried out in an inert atmosphere to achieve local carbonization of the blade resin matrix and enhanced modulation of the wave absorption characteristics, thereby obtaining primary pyrolysis blades for standby use.

[0032] The inert atmosphere can be either N2 or CO2. The cutting size mainly depends on the size of the pyrolysis furnace, which is convenient for pyrolysis and also takes into account the actual needs of high-performance concrete at the back end. As a specific example, the retired wind turbine blades are cut into a size of about 5cm*5cm in length and width.

[0033] (2) The primary pyrolysis blades in (1) are sent into a microwave pyrolysis furnace for enhanced pyrolysis for 4-8 minutes. The microwave enhanced pyrolysis power is 600 W or more, and the frequency is 915 MHz or more. As an optional implementation, the microwave enhanced pyrolysis power is 900 W and the frequency is 2450 MHz.

[0034] By utilizing the strong wave absorption characteristics of the carbon-based components in the primary pyrolysis leaves and the inducible local high-temperature thermal shock characteristics, targeted energy is used to enhance the deposition of carbon dots on the fibers to achieve in-situ controllable synthesis of fiber-carbon dot composite materials, in addition to a small amount of carbon material;

[0035] (3) The pyrolysis oil and pyrolysis gas produced by the pyrolysis in (1) and (2) are recycled to supply energy for the conventional pyrolysis in (1) as a conventional pyrolysis fuel source;

[0036] (4) Screening the solid product in (2) to separate the fiber-carbon dot composite material and the carbon black material. The carbon black material can be used in the fields of chemical industry, rubber, plastic, ink, etc., and can also be used to improve the conductivity, light absorption and heat resistance of concrete;

[0037] (5) Take 3-6 parts of the solid product fiber-carbon point composite material obtained by screening in (4), 80-100 parts of sulfur-aluminum-iron low-carbon cementitious material, 10-15 parts of silica fume, 5-10 parts of slag powder, 1-2 parts of steel fiber, 1-3 parts of water reducer, 0.2-0.6 parts of retarder, 0.1-0.2 parts of defoamer, 1.2 mortar-sand ratio, 0.20 water-cement ratio, mix well and pour into shape, demould after 6 hours, place in a standard curing room for curing for 28 days, and high-toughness high-performance / ultra-high-performance concrete can be prepared. Under the condition of passing, high-performance concrete generally has a compressive strength of more than 80MPa, while ultra-high-performance concrete has a compressive strength of more than 120MPa.

[0038] The present invention utilizes microwave enhanced pyrolysis targeted energy to enhance the deposition of carbon dots on fibers, solves the problem of carbon dot deposition disposal and recovery on fibers, enhances the deposition of carbon dots on the fiber surface, and retains the original properties of the fibers to the maximum extent, thereby synthesizing fiber-carbon dot composite materials by in-situ assembly.

[0039] Based on the effective modification of high-performance / ultra-high-performance concrete by fiber-carbon dot composites, the comprehensive performance of concrete is improved by utilizing the tensile properties of fibers, the internal curing function of carbon dots and the strong bonding of fiber-carbon dot composites, thus solving the problem of high-value recycling of retired wind turbine blades and realizing the large-scale high-value application expansion.

[0040] Thermosetting resin-based composites in retired wind turbine blades have high hardness and density, are difficult to dissociate directly, and have poor thermal conductivity. Conventional pyrolysis technology based solely on "outside-to-inside" heat conduction is difficult to balance pyrolysis effect and economy; and microwave pyrolysis technology based solely on "inside-to-outside" overall heating is directly restricted by the weak microwave absorption capacity of the original components of the blades and the efficiency of microwave energy utilization.

[0041] To this end, this embodiment proposes to first use conventional heat sources to achieve local degradation of the resin matrix and the formation of primary pyrolytic carbon in retired wind turbine blades at 400-600°C; at this time, microwave-enhanced pyrolysis is applied, and microwave energy is efficiently and selectively applied to the primary pyrolytic carbon with strong wave absorption characteristics to form micro-domain high-energy sites. The overall pyrolysis temperature is only slightly increased, but the local high temperature (up to 1000-2000°C) and induced effect of the pyrolytic carbon particles can greatly accelerate the pyrolysis process, shorten the pyrolysis time and improve the pyrolysis efficiency, so that the total pyrolysis time can be shortened by 50-80%. In addition, based on the local thermal shock of microwaves, the deposition of carbon points on the fiber surface leads to the in-situ assembly and strong bonding of fiber-carbon point composites, which is contrary to the separation of carbon points and fibers emphasized in the prior art. By strengthening the bonding of fibers and carbon points, on the one hand, the original strength of the fibers in the composite is guaranteed, and on the other hand, the roughness of the fiber surface is improved, which can further strengthen the interfacial bonding ability of the fibers, thereby improving the splitting tensile strength and bending strength of concrete. In addition, the carbon dots attached to the fibers also enhance the dispersion of the carbon dots in the concrete. The carbon dots can also play an internal curing role in the concrete and broaden the functional applications of concrete in induction heating, electromagnetic shielding, fire protection and antifreeze.

[0042] Example 1

[0043] This embodiment proposes a method for efficient pyrolysis recovery and resource recycling of retired wind turbine blades, including the following steps:

[0044] (1) After the retired wind turbine blades are appropriately cut, they are placed in a conventional pyrolysis furnace at 400°C for primary pyrolysis for 30 minutes. The pyrolysis process is carried out in an inert atmosphere to achieve local carbonization of the blade resin matrix and enhanced modulation of the wave absorption characteristics, thereby obtaining primary pyrolysis blades for standby use;

[0045] (2) The primary pyrolysis blades in (1) are sent into a microwave pyrolysis furnace for enhanced pyrolysis for 8 minutes. The microwave enhanced pyrolysis power is 600 W or more, and the frequency is 915 MHz or more. As an optional implementation, the microwave enhanced pyrolysis power is 900 W and the frequency is 2450 MHz.

[0046] By utilizing the strong wave absorption characteristics of the carbon-based components in the primary pyrolysis leaves and the inducible local high-temperature thermal shock characteristics, targeted energy is used to enhance the deposition of carbon dots on the fibers to achieve in-situ controllable synthesis of fiber-carbon dot composite materials, in addition to a small amount of carbon material;

[0047] (3) recycling the pyrolysis oil and pyrolysis gas produced by pyrolysis in (1) and (2) to supply energy for conventional pyrolysis in (1) as a conventional pyrolysis fuel source;

[0048] (4) Screening the solid product in (2) to separate the fiber-carbon dot composite and the carbon black material. The carbon black material can be used in the fields of chemical industry, rubber, plastic, ink, etc., and can also be used to improve the conductivity, light absorption and heat resistance of concrete;

[0049] (5) Take 3 parts of the solid product fiber-carbon point composite material in (4), 80 parts of sulfur-aluminum-iron low-carbon cementitious material, 10 parts of silica fume, 10 parts of slag powder, 2 parts of steel fiber, 1 part of water reducer, 0.2 parts of retarder, 0.1 parts of defoamer, mortar-sand ratio of 1.2, water-cement ratio of 0.20, mix well and pour into shape, demould after 6 hours, place in a standard curing room for curing for up to 28 days, and high-toughness and high-performance concrete can be prepared.

[0050] Example 2

[0051] This embodiment proposes a method for efficient pyrolysis recovery and resource recycling of retired wind turbine blades, including the following steps:

[0052] (1) After the retired wind turbine blades are appropriately cut, they are placed in a conventional pyrolysis furnace at 500°C for primary pyrolysis for 20 minutes. The pyrolysis process is carried out in an inert atmosphere to achieve local carbonization of the blade resin matrix and enhanced modulation of the wave absorption characteristics, thereby obtaining primary pyrolysis blades for standby use;

[0053] (2) The primary pyrolysis blades in (1) are sent into a microwave pyrolysis furnace for enhanced pyrolysis for 6 minutes. The microwave enhanced pyrolysis power is 600 W or more, and the frequency is 915 MHz or more. As an optional implementation, the microwave enhanced pyrolysis power is 900 W and the frequency is 2450 MHz.

[0054] By utilizing the strong wave absorption characteristics of the carbon-based components in the primary pyrolysis leaves and the inducible local high-temperature thermal shock characteristics, targeted energy is used to enhance the deposition of carbon dots on the fibers to achieve in-situ controllable synthesis of fiber-carbon dot composite materials, in addition to a small amount of carbon material;

[0055] (3) recycling the pyrolysis oil and pyrolysis gas produced by pyrolysis in (1) and (2) to supply energy for conventional pyrolysis in (1) as a conventional pyrolysis fuel source;

[0056] The solid product in (2) is screened to separate the fiber-carbon point composite and the carbon black material. The carbon black material can be used in the fields of chemical industry, rubber, plastic, ink, etc., and can also be used to improve the conductivity, light absorption and heat resistance of concrete;

[0057] (4) Take 4.5 parts of the solid product fiber-carbon point composite material in (4), 90 parts of sulfur-aluminum-iron low-carbon cementitious material, 12 parts of silica fume, 8 parts of slag powder, 1.5 parts of steel fiber, 2 parts of water reducer, 0.4 parts of retarder, 0.15 parts of defoamer, the mortar-sand ratio is 1.2, the water-cement ratio is 0.20, stir evenly and pour into shape, demould after 6 hours, place in a standard curing room for curing for up to 28 days, and high-toughness and high-performance concrete can be prepared.

[0058] Example 3

[0059] This embodiment proposes a method for efficient pyrolysis recovery and resource recycling of retired wind turbine blades, including the following steps:

[0060] (1) After the retired wind turbine blades are appropriately cut, they are placed in a conventional pyrolysis furnace at 600°C for primary pyrolysis for 10 minutes. The pyrolysis process is carried out in an inert atmosphere to achieve local carbonization of the blade resin matrix and enhanced modulation of the wave absorption characteristics, thereby obtaining primary pyrolysis blades for standby use;

[0061] (2) The primary pyrolysis blades in (1) are sent into a microwave pyrolysis furnace for enhanced pyrolysis for 4 minutes. The microwave enhanced pyrolysis power is 600 W or more, and the frequency is 915 MHz or more. As an optional implementation, the microwave enhanced pyrolysis power is 900 W and the frequency is 2450 MHz.

[0062] By utilizing the strong wave absorption characteristics of the carbon-based components in the primary pyrolysis leaves and the inducible local high-temperature thermal shock characteristics, targeted energy is used to enhance the deposition of carbon dots on the fibers to achieve in-situ controllable synthesis of fiber-carbon dot composite materials, in addition to a small amount of carbon material;

[0063] (3) recycling the pyrolysis oil and pyrolysis gas produced by pyrolysis in (1) and (2) to supply energy for conventional pyrolysis in (1) as a conventional pyrolysis fuel source;

[0064] (4) Screening the solid product in (2) to separate the fiber-carbon dot composite and the carbon black material. The carbon black material can be used in the fields of chemical industry, rubber, plastic, ink, etc., and can also be used to improve the conductivity, light absorption and heat resistance of concrete;

[0065] (5) Take 6 parts of the solid product fiber-carbon point composite material in (4), 100 parts of sulfur-aluminum-iron low-carbon cementitious material, 15 parts of silica fume, 5 parts of slag powder, 1 part of steel fiber, 3 parts of water reducer, 0.6 parts of retarder, 0.2 parts of defoamer, the mortar-sand ratio is 1.2, the water-cement ratio is 0.20, stir evenly and pour into shape, demould after 6 hours, place in a standard curing room for curing for up to 28 days, and high-toughness ultra-high performance concrete can be prepared.

[0066] Concrete was prepared by the material proportions for preparing concrete given in Example 1 to Example 3, and the performance of the concrete was characterized by compressive strength and flexural strength. At the same time, based on the materials and proportions of Example 1 to Example 3, the fiber-carbon point composite material was removed respectively, and the other contents were the same. As a control group of the corresponding example, the performance of the concrete was still characterized by compressive strength and flexural strength. The comparison of the performance parameters of the obtained concrete is shown in Table 1 below.

[0067] Table 1 Comparison of performance parameters of high toughness high performance / ultra-high performance concrete

[0068]

[0069] It can be found that the recycled fiber-carbon point composite can effectively improve the strength and toughness of high-performance concrete, proving the possibility of high-value application of wind turbine blade recycling products.

[0070] Example 4

[0071] In one or more embodiments, a system for efficient pyrolysis recovery and resource recycling of retired wind turbine blades is disclosed, comprising:

[0072] A wind turbine blade cutting device, used for cutting retired wind turbine blades;

[0073] A primary pyrolysis furnace is used to place the cut retired wind turbine blades at 400-600°C for primary pyrolysis to obtain primary pyrolysis blades with partial carbonization of the resin matrix;

[0074] A microwave pyrolysis furnace is used to perform microwave-enhanced pyrolysis on primary pyrolysis blades to enhance the deposition of carbon dots on the fibers to synthesize fiber-carbon dot composite materials;

[0075] The separation device is used to screen the solid product obtained by microwave enhanced pyrolysis to separate the fiber-carbon point composite material and the carbon black material.

[0076] The above-mentioned devices can be realized by using existing technologies, and this embodiment protects the working process of the entire system.

[0077] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A method for efficient pyrolysis recovery and resource recycling of retired wind turbine blades, characterized in that: include: After cutting the retired wind turbine blades, the blades are placed at 400-600°C for primary pyrolysis to obtain primary pyrolysis blades with partial carbonization of the resin matrix; The primary pyrolysis blades are subjected to microwave-enhanced pyrolysis to enhance the deposition of carbon dots on the fibers to synthesize fiber-carbon dot composite materials; The solid products obtained by microwave enhanced pyrolysis were screened to separate the fiber-carbon dot composite material and the carbon black material.

2. The method for efficient pyrolysis recovery and resource recycling of retired wind turbine blades according to claim 1, characterized in that: The fiber-carbon point composite material is used for preparing concrete.

3. A method for efficient pyrolysis recovery and resource recycling of retired wind turbine blades as claimed in claim 2, characterized in that: The concrete preparation method is as follows: 3-6 parts of fiber-carbon point composite material, 80-100 parts of sulfur-aluminum-iron low-carbon cementitious material, 10-15 parts of silica fume, 5-10 parts of slag powder, 1-2 parts of steel fiber, 1-3 parts of water reducer, 0.2-0.6 parts of retarder, 0.1-0.2 parts of defoamer, mortar-sand ratio of 1.2, water-cement ratio of 0.20, stir evenly and pour into shape, demould after a set time and place in a standard curing room for curing for a set number of days to prepare high performance / ultra-high performance concrete.

4. The method for efficient pyrolysis recovery and resource recycling of retired wind turbine blades as claimed in claim 3, characterized in that: The mold was removed after 6 hours of pouring and then placed in a standard curing room for 28 days.

5. The method for efficient pyrolysis recovery and resource recycling of retired wind turbine blades according to claim 1, characterized in that: The pyrolysis oil and pyrolysis gas produced by primary pyrolysis and microwave enhanced pyrolysis are recycled to supply energy for primary pyrolysis.

6. The method for efficient pyrolysis recovery and resource recycling of retired wind turbine blades according to claim 1, characterized in that: After the retired wind turbine blades are cut, they are placed at 400-600°C for primary pyrolysis for 10-30 minutes.

7. The method for efficient pyrolysis recovery and resource recycling of retired wind turbine blades according to claim 1, characterized in that: The primary pyrolysis blades are subjected to microwave-enhanced pyrolysis for 4-8 minutes, the microwave-enhanced pyrolysis power is 600 W or more, and the frequency is 915 MHz or more.

8. The method for efficient pyrolysis recovery and resource recycling of retired wind turbine blades as claimed in claim 1, characterized in that: The primary pyrolysis is carried out in an inert atmosphere to achieve local carbonization of the blade resin matrix and enhanced modulation of the wave absorption characteristics.

9. The method for efficient pyrolysis recovery and resource recycling of retired wind turbine blades as claimed in claim 1, characterized in that: The microwave enhanced pyrolysis power is 900W and the frequency is 2450MHz.

10. A system for efficient pyrolysis recovery and resource recycling of retired wind turbine blades, characterized in that: include: A wind turbine blade cutting device, used for cutting retired wind turbine blades; A primary pyrolysis furnace is used to place the cut retired wind turbine blades at 400-600°C for primary pyrolysis to obtain primary pyrolysis blades with partial carbonization of the resin matrix; A microwave pyrolysis furnace is used to perform microwave-enhanced pyrolysis on primary pyrolysis blades to enhance the deposition of carbon dots on the fibers to synthesize fiber-carbon dot composite materials; The separation device is used to screen the solid product obtained by microwave enhanced pyrolysis to separate the fiber-carbon point composite material and the carbon black material.

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